added ~ as home processing

cmd/cat.go

@@ -2,13 +2,17 @@ package cmd
 
 import (
 	"gosh/types"
+	"gosh/util"
 	"os"
 
 	"github.com/fatih/color"
 )
 
-func GoshCat(sh *types.Shell, filename string) types.CmdOutput {
-	data, err := os.ReadFile(filename)
+func GoshCat(sh *types.Shell, file_path string) types.CmdOutput {
+
+	file_path = util.ExpandHome(file_path)
+
+	data, err := os.ReadFile(file_path)
 	red := color.New(color.FgRed).SprintFunc()
 	if err != nil {
 		return types.CmdOutput{Id: 1, Output: red(err)}