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

justfile

@@ -31,7 +31,7 @@ run-tests cc=default_cc: (build-tests cc)
 
 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) $(CXXFLAGS) /Fe$@ $<
 
 clean:
-    del /Q build
+    rd /s /q $(OUTPATH)