fix: no error report when 'build' folder is already exists on Windows

justfile

@@ -14,24 +14,24 @@ build-tests cc=default_cc:
     #!/bin/bash
     set -e
     set -x
-    mkdir -p {{ outpath }}
+    mkdir -p "{{ outpath }}"
     for src in {{ srcs }}; do
         file=`basename $src`;
         outbin="{{ outpath }}/${file%.*}";
-        {{ cc }} $src -I{{ include }} -o $outbin {{ cppflags }};
+        {{ cc }} $src -I"{{ include }}" -o "$outbin" {{ cppflags }};
     done
 
 run-tests cc=default_cc: (build-tests cc)
     #!/bin/bash
     set -e
     set -x
-    for bin in {{ outpath }}/*; do
+    for bin in "{{ outpath }}"/*; do
         $bin;
     done
 
 nmake-tests:
     nmake -f nmakefile
-    Get-ChildItem build -Filter *.exe | Foreach-Object { & $_.FullName }
+    Get-ChildItem "{{ outpath }}" -Filter *.exe | Foreach-Object { & $_.FullName }
 
 clean:
-    rm -r ./build
+    rm -r "{{ outpath }}"

nmakefile

@@ -1,17 +1,17 @@
-
 CC = cl
 INCLUDES = ./include
-CXXFLAGS = /std:c++20 /EHs /Wall /Fo./build/
+OUTPATH = ./build
+CXXFLAGS = /std:c++20 /EHs /Wall /Fo"$(OUTPATH)"
 
 EXES = $(**:.cpp=.exe)
 
 .SUFFIXES: .cpp .exe
 all: tests\*.cpp
-    mkdir build
+    IF NOT EXIST "$(OUTPATH)" md "$(OUTPATH)"
     $(MAKE) /f nmakefile $(EXES:tests=build)
 
 {tests\}.cpp{build\}.exe:
-    $(CC) /I $(INCLUDES) $(CXXFLAGS) /Fe$@ $<
+    $(CC) /I "$(INCLUDES)" $(CXXFLAGS) /Fe"$@" "$<"
 
 clean:
-    del /Q build
+    rd /s /q "$(OUTPATH)"