feat(formatters): add formatter for the 'custom' module

src/formatters.zig

@@ -22,6 +22,7 @@ pub const formatters = [_]*const fn (allocator: std.mem.Allocator, key: []const
     &getFormattedNetInfo,
     &getFormattedTerminalNameInfo,
     &getFormattedLocaleInfo,
+    &getFormattedCustom,
 };
 
 pub const default_formatters = [_]*const fn (allocator: std.mem.Allocator) anyerror!Result{
@@ -207,3 +208,7 @@ pub fn getFormattedNetInfo(allocator: std.mem.Allocator, key: []const u8, key_co
 
     return Result{ .string_arraylist = formatted_net_info_list };
 }
+
+pub fn getFormattedCustom(allocator: std.mem.Allocator, key: []const u8, key_color: []const u8) !Result {
+    return Result{ .string = try std.fmt.allocPrint(allocator, "{s}{s}{s}", .{ key_color, key, ascii.Reset }) };
+}