vcreate: use underscores instead of spaces for names (#9257)

cmd/tools/vcreate.v

@@ -21,6 +21,15 @@ fn cerror(e string) {
 	eprintln('\nerror: $e')
 }
 
+fn check_name(name string) string {
+	if name.contains(' ') {
+		cname := name.replace(' ', '_')
+		eprintln('warning: the project name cannot contain spaces, the name will be changed to `$cname`')
+		return cname
+	}
+	return name
+}
+
 fn vmod_content(c Create) string {
 	return [
 		'Module {',
@@ -99,7 +108,7 @@ fn (c &Create) create_git_repo(dir string) {
 
 fn create(args []string) {
 	mut c := Create{}
-	c.name = if args.len > 0 { args[0] } else { os.input('Input your project name: ') }
+	c.name = check_name(if args.len > 0 { args[0] } else { os.input('Input your project name: ') })
 	if c.name == '' {
 		cerror('project name cannot be empty')
 		exit(1)
@@ -136,7 +145,7 @@ fn init_project() {
 		exit(3)
 	}
 	mut c := Create{}
-	c.name = os.file_name(os.getwd())
+	c.name = check_name(os.file_name(os.getwd()))
 	c.description = ''
 	c.write_vmod(false)
 	c.write_main(false)