run C.md

{
"shell_cmd" : "gcc $file_name -o ${file_base_name}",
"working_dir" : "$file_path",
 
"variants":
[
    {
        "name": "Run",
        "shell_cmd": "gcc $file_name -o ${file_base_name} && ${file_path}/${file_base_name}"
    }
]
}