Fixing double spacing

command_builder.h

@@ -59,13 +59,13 @@ namespace build {
   void command_builder::write(version const & vers) {
     switch (vers) {
     case version::cxx11:
-      buffer_ << ' ' << "-std=c++11";
+      buffer_ << "-std=c++11";
       break;
     case version::cxx14:
-      buffer_ << ' ' << "-std=c++14";
+      buffer_ << "-std=c++14";
       break;
     case version::cxx17:
-      buffer_ << ' ' << "-std=c++17";
+      buffer_ << "-std=c++17";
       break;
     case none:
       break;
@@ -73,11 +73,11 @@ namespace build {
   }
 
   void command_builder::write(source_file const & file) {
-    buffer_ << " -c " << file.get();
+    buffer_ << "-c " << file.get();
   }
 
   void command_builder::write(output_file const & file) {
-    buffer_ << " -o " << file.get();
+    buffer_ << "-o " << file.get();
   }
 
   std::ostream & operator<<(std::ostream & os, indent_t const & value) {