diff --git a/Cargo.lock b/Cargo.lock
index 2d05054..85b51d1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -44,6 +44,20 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "box-str-dhat"
+version = "0.1.0"
+dependencies = [
+ "dhat",
+]
+
+[[package]]
+name = "box-str-program"
+version = "0.1.0"
+dependencies = [
+ "dhat",
+]
+
 [[package]]
 name = "cc"
 version = "1.0.73"
@@ -77,13 +91,6 @@ version = "0.26.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78cc372d058dcf6d5ecd98510e7fbc9e5aec4d21de70f65fea8fecebcd881bd4"
 
-[[package]]
-name = "heap-program"
-version = "0.1.0"
-dependencies = [
- "dhat",
-]
-
 [[package]]
 name = "instant"
 version = "0.1.12"
@@ -258,10 +265,25 @@ version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
 
+[[package]]
+name = "stack-and-heap-program"
+version = "0.1.0"
+
 [[package]]
 name = "stack-program"
 version = "0.1.0"
 
+[[package]]
+name = "string-dhat"
+version = "0.1.0"
+dependencies = [
+ "dhat",
+]
+
+[[package]]
+name = "string-program"
+version = "0.1.0"
+
 [[package]]
 name = "syn"
 version = "1.0.96"
diff --git a/Cargo.toml b/Cargo.toml
index 60fa435..33da0a4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,2 +1,2 @@
 [workspace]
-members = ["stack-program", "heap-program"]
+members = ["stack-program", "stack-and-heap-program", "string-program", "box-str-program", "string-dhat", "box-str-dhat"]
diff --git a/heap-program/Cargo.toml b/box-str-dhat/Cargo.toml
similarity index 86%
rename from heap-program/Cargo.toml
rename to box-str-dhat/Cargo.toml
index 53d8fe1..e4a2d4b 100644
--- a/heap-program/Cargo.toml
+++ b/box-str-dhat/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "heap-program"
+name = "box-str-dhat"
 version = "0.1.0"
 edition = "2021"
 
diff --git a/box-str-dhat/src/main.rs b/box-str-dhat/src/main.rs
new file mode 100644
index 0000000..c997a12
--- /dev/null
+++ b/box-str-dhat/src/main.rs
@@ -0,0 +1,10 @@
+#[global_allocator]
+static ALLOC: dhat::Alloc = dhat::Alloc;
+
+fn main() {
+    let _profiler = dhat::Profiler::new_heap();
+
+    let boxed_str: Box<str> = "hello".into();
+
+    println!("boxed_str: {}", boxed_str);
+}
diff --git a/box-str-program/Cargo.toml b/box-str-program/Cargo.toml
new file mode 100644
index 0000000..37a7b70
--- /dev/null
+++ b/box-str-program/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "box-str-program"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+dhat = "0.3.0"
+
+[features]
+dhat-heap = []    # if you are doing heap profiling
diff --git a/box-str-program/src/main.rs b/box-str-program/src/main.rs
new file mode 100644
index 0000000..13f9177
--- /dev/null
+++ b/box-str-program/src/main.rs
@@ -0,0 +1,6 @@
+fn main() {
+    let boxed_str: Box<str> = "hello".into();
+
+    println!("boxed_str: {}", boxed_str);
+    println!("size of boxed_str on stack: {}", std::mem::size_of_val(&boxed_str));
+}
diff --git a/dhat-heap.json b/dhat-heap.json
new file mode 100644
index 0000000..2019fc4
--- /dev/null
+++ b/dhat-heap.json
@@ -0,0 +1,93 @@
+{
+"dhatFileVersion": 2,
+"mode": "rust-heap",
+"verb": "Allocated",
+"bklt": true,
+"bkacc": false,
+"tu": "µs",
+"Mtu": "s",
+"tuth": 10,
+"cmd": "target/debug/box-str-dhat",
+"pid": 76713,
+"tg": 177,
+"te": 209,
+"pps": [
+{
+"tb": 5,
+"tbk": 1,
+"tl": 63,
+"mb": 5,
+"mbk": 1,
+"gb": 5,
+"gbk": 1,
+"eb": 0,
+"ebk": 0,
+"fs": [
+1,
+2,
+3,
+4,
+5,
+6
+]
+},
+{
+"tb": 1024,
+"tbk": 1,
+"tl": 32,
+"mb": 1024,
+"mbk": 1,
+"gb": 1024,
+"gbk": 1,
+"eb": 1024,
+"ebk": 1,
+"fs": [
+7,
+8,
+9,
+10,
+11,
+12,
+13,
+14,
+15,
+16,
+17,
+18,
+19,
+20,
+21,
+22,
+23,
+24
+]
+}
+],
+"ftbl": [
+"[root]",
+"0x1047ca668: <alloc::alloc::Global as core::alloc::Allocator>::allocate (alloc/src/alloc.rs:231:9)",
+"0x1047c97bc: alloc::raw_vec::RawVec<T,A>::allocate_in (alloc/src/raw_vec.rs:185:45)",
+"0x1047c9d5c: alloc::raw_vec::RawVec<T,A>::with_capacity_in (alloc/src/raw_vec.rs:132:9)",
+"0x104792bf8: alloc::raw_vec::RawVec<T>::with_capacity (alloc/src/raw_vec.rs:93:9)",
+"0x104793128: <alloc::boxed::Box<[T]> as core::convert::From<&[T]>>::from (alloc/src/boxed.rs:1422:19)",
+"0x1047928e4: <alloc::boxed::Box<str> as core::convert::From<&str>>::from (alloc/src/boxed.rs:1464:44)",
+"0x1048b5920: <alloc::alloc::Global as core::alloc::Allocator>::allocate (alloc/src/alloc.rs:231:9)",
+"0x1048b5920: alloc::raw_vec::RawVec<T,A>::allocate_in (alloc/src/raw_vec.rs:185:45)",
+"0x1048b5920: alloc::raw_vec::RawVec<T,A>::with_capacity_in (alloc/src/raw_vec.rs:132:9)",
+"0x1048b5920: alloc::vec::Vec<T,A>::with_capacity_in (src/vec/mod.rs:613:20)",
+"0x1048b5920: alloc::vec::Vec<T>::with_capacity (src/vec/mod.rs:470:9)",
+"0x1048b5920: std::io::buffered::bufwriter::BufWriter<W>::with_capacity (io/buffered/bufwriter.rs:115:33)",
+"0x1048b5920: std::io::buffered::linewriter::LineWriter<W>::with_capacity (io/buffered/linewriter.rs:109:29)",
+"0x1048b5920: std::io::buffered::linewriter::LineWriter<W>::new (io/buffered/linewriter.rs:89:9)",
+"0x1048b5920: std::io::stdio::stdout::{{closure}} (src/io/stdio.rs:609:58)",
+"0x1048b5920: std::lazy::SyncOnceCell<T>::get_or_init_pin::{{closure}} (std/src/lazy.rs:375:25)",
+"0x1048b5920: std::sync::once::Once::call_once_force::{{closure}} (src/sync/once.rs:334:40)",
+"0x1048d28fc: std::sync::once::Once::call_inner (src/sync/once.rs:434:21)",
+"0x1048b3378: std::sync::once::Once::call_once_force (src/sync/once.rs:334:9)",
+"0x1048b3378: std::lazy::SyncOnceCell<T>::get_or_init_pin (std/src/lazy.rs:374:9)",
+"0x1048b3378: std::io::stdio::stdout (src/io/stdio.rs:608:16)",
+"0x1048b3378: std::io::stdio::print_to (src/io/stdio.rs:1016:21)",
+"0x1048b3378: std::io::stdio::_print (src/io/stdio.rs:1029:5)",
+"0x104792d58: box_str_dhat::main (box-str-dhat/src/main.rs:9:5)"
+]
+}
\ No newline at end of file
diff --git a/heap-program/src/main.rs b/heap-program/src/main.rs
deleted file mode 100644
index ee8eae7..0000000
--- a/heap-program/src/main.rs
+++ /dev/null
@@ -1,35 +0,0 @@
-use std::io::{self, Read};
-
-fn stdin_boxed_str() -> Box<str> {
-    let mut buff = [0; 10];
-    let mut stdin = io::stdin(); // We get `Stdin` here.
-    stdin.read(&mut buff).unwrap();
-    let s = std::str::from_utf8(&buff).unwrap();
-
-    s.into()
-}
-
-fn stdin_string() -> String {
-    let mut buff = String::new();
-    std::io::stdin().read_line(&mut buff).unwrap();
-
-    buff
-}
-
-fn my_simple_program(a: i32) -> i32 {
-    let b = 10;
-    a + b
-}
-
-
-fn main() {
-    println!("{}", my_simple_program(5));
-
-    let boxed_str = stdin_boxed_str();
-
-    println!("boxed_str: {}", boxed_str);
-
-    let stdin_str = stdin_string();
-
-    println!("stdin_str: {}", stdin_str);
-}
diff --git a/stack-and-heap-program/Cargo.lock b/stack-and-heap-program/Cargo.lock
new file mode 100644
index 0000000..091761d
--- /dev/null
+++ b/stack-and-heap-program/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "stack-and-heap-program"
+version = "0.1.0"
diff --git a/stack-and-heap-program/Cargo.toml b/stack-and-heap-program/Cargo.toml
new file mode 100644
index 0000000..2a1b53b
--- /dev/null
+++ b/stack-and-heap-program/Cargo.toml
@@ -0,0 +1,4 @@
+[package]
+name = "stack-and-heap-program"
+version = "0.1.0"
+edition = "2021"
diff --git a/stack-and-heap-program/src/main.rs b/stack-and-heap-program/src/main.rs
new file mode 100644
index 0000000..90755ac
--- /dev/null
+++ b/stack-and-heap-program/src/main.rs
@@ -0,0 +1,5 @@
+fn main() {
+    let a = Box::new(5_u8);
+    let b = 10_u8;
+    println!("{}, {}", a, b);
+}
diff --git a/string-dhat/Cargo.lock b/string-dhat/Cargo.lock
new file mode 100644
index 0000000..01724dd
--- /dev/null
+++ b/string-dhat/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "string-dhat"
+version = "0.1.0"
diff --git a/string-dhat/Cargo.toml b/string-dhat/Cargo.toml
new file mode 100644
index 0000000..b0104b2
--- /dev/null
+++ b/string-dhat/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "string-dhat"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+dhat = "0.3.0"
diff --git a/string-dhat/src/main.rs b/string-dhat/src/main.rs
new file mode 100644
index 0000000..8488611
--- /dev/null
+++ b/string-dhat/src/main.rs
@@ -0,0 +1,9 @@
+#[global_allocator]
+static ALLOC: dhat::Alloc = dhat::Alloc;
+
+fn main() {
+    let _profiler = dhat::Profiler::new_heap();
+
+    let s = String::from("hello");
+    println!("{}", s);
+}
diff --git a/string-program/Cargo.lock b/string-program/Cargo.lock
new file mode 100644
index 0000000..272f9af
--- /dev/null
+++ b/string-program/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "string-program"
+version = "0.1.0"
diff --git a/string-program/Cargo.toml b/string-program/Cargo.toml
new file mode 100644
index 0000000..50c3ff6
--- /dev/null
+++ b/string-program/Cargo.toml
@@ -0,0 +1,4 @@
+[package]
+name = "string-program"
+version = "0.1.0"
+edition = "2021"
diff --git a/string-program/src/main.rs b/string-program/src/main.rs
new file mode 100644
index 0000000..f08a91d
--- /dev/null
+++ b/string-program/src/main.rs
@@ -0,0 +1,5 @@
+fn main() {
+    let s = String::from("hello!");
+    println!("{}", s);
+    println!("size of string on stack: {}", std::mem::size_of_val(&s));
+}