internal/calculator/internal/repl: Add missing comments for exported functions

- Added Parse() comment in calculator.go
- Updated Commands() comment in repl/commands.go to be more descriptive

2 files changed, 3 insertions, 1 deletions

diff --git a/internal/calculator/calculator.go b/internal/calculator/calculator.go
index fdca99b..b876a48 100644
--- a/internal/calculator/calculator.go
+++ b/internal/calculator/calculator.go
@@ -7,6 +7,8 @@ import (
 	"strings"
 )
 
+// Parse parses a percentage calculation input string and returns the result.
+// It handles formats like "20% of 150", "30 is what % of 150", and "30 is 20% of what".
 func Parse(input string) (string, error) {
 	input = strings.ToLower(strings.TrimSpace(input))
 	input = strings.ReplaceAll(input, "what is ", "")
diff --git a/internal/repl/commands.go b/internal/repl/commands.go
index 656f670..d03672e 100644
--- a/internal/repl/commands.go
+++ b/internal/repl/commands.go
@@ -8,7 +8,7 @@ import (
 // builtinCommands defines the built-in REPL commands
 var builtinCommands = []string{"help", "clear", "quit", "exit", "rpn", "calc"}
 
-// Commands returns the list of built-in command names
+// Commands returns the list of built-in command names supported by the REPL.
 func Commands() []string {
 	return builtinCommands
 }