created why2_toml_write_preserve rust fn

same as why2_toml_write but does not remove comments

include/chat/config.h

@@ -40,6 +40,7 @@ void why2_chat_init_authority(void); //CREATE WHY2_CHAT_AUTHORITY_DIR
 
 char *why2_toml_read(const char* path, const char* key); //READ key FROM path TOML FILE
 void why2_toml_write(const char *path, const char *key, const char *value); //WRITE value AS key INTO path TOML FILE
+void why2_toml_write_preserve(const char *path, const char *key, const char *value); //WRITE value AS key INTO path TOML FILE WITHOUT REMOVING COMMENTS
 why2_bool why2_toml_contains(const char *path, const char *key); //CHECK IF path CONTAINS key
 why2_bool why2_toml_equals(const char *path, const char *key, const char *value); //CHECK IF key IN path IS EQUAL TO value
 void why2_toml_read_free(char* s); //DEALLOCATE THE READ VALUE

src/chat/config/Cargo.toml

@@ -25,3 +25,4 @@ crate-type = ["cdylib"]
 
 [dependencies]
 toml = "*"
+toml_edit = "*"

src/chat/config/src/lib.rs

@@ -126,6 +126,48 @@ pub extern "C" fn why2_toml_write(path: *const c_char, key: *const c_char, value
     }
 }
 
+#[no_mangle]
+pub extern "C" fn why2_toml_write_preserve(path: *const c_char, key: *const c_char, value: *const c_char)
+{
+    //CONVERT C STRINGS TO RUST STRINGS
+    let path_r = unsafe { CStr::from_ptr(path).to_string_lossy().into_owned() };
+    let key_r = unsafe { CStr::from_ptr(key).to_string_lossy().into_owned() };
+    let value_r = unsafe { CStr::from_ptr(value).to_string_lossy().into_owned() };
+
+    //READ FILE
+    let file_raw = match read_to_string(&path_r)
+    {
+        Ok(raw) => raw,
+        Err(e) =>
+        {
+            eprintln!("Could not read TOML config '{}': {}", path_r, e);
+            return;
+        }
+    };
+
+    //PARSE TO A toml_edit Document
+    let mut doc: toml_edit::Document = match file_raw.parse()
+    {
+        Ok(doc) => doc,
+        Err(e) =>
+        {
+            eprintln!("Could not parse TOML config '{}': {}", path_r, e);
+            return;
+        }
+    };
+
+    doc[&key_r] = toml_edit::value(value_r);
+
+    //CONVERT DOCUMENT TO STRING
+    let updated_data = doc.to_string();
+
+    //WRITE
+    if let Err(e) = write(&path_r, updated_data)
+    {
+        eprintln!("Could not write to TOML config '{}': {}", path_r, e);
+    }
+}
+
 #[no_mangle]
 pub extern "C" fn why2_toml_contains(path: *const c_char, key: *const c_char) -> bool
 {