Question for text "//" in many scripts of SOPC Builder

I saw many scripts of SOPC Builder contains text "//"

in path parameters.

Are they OK???

Or they are BUGs???

For example of SOPC Builder 9.1:

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Info: Starting PTF file elaboration.

"c:/altera/91/quartus//bin/jre/bin/java.exe" -Xmx512M -classpath

"c:/altera/91/quartus//sopc_builder/bin/sopc_builder.jar;

c:/altera/91/quartus//sopc_builder/bin/PinAssigner.jar;

c:/altera/91/quartus//sopc_builder/bin/sopc_wizard.jar;

c:/altera/91/quartus//sopc_builder/bin/jptf.jar"

sopc_builder.sopc_builder -d"c:/altera/91/quartus//sopc_builder"

-notalkback=1 -projectnameDE3_DDR2.qpf

-projectpathC:/user/v300/DE3_150_DDR2_1G_2RANK_ssram_haha

--no_splash --refresh C:/user/v300/DE3_150_DDR2_1G_2RANK_ssram_haha/DE3_SOPC.v

--quartus_dir="c:/altera/91/quartus/" --sopc_perl="c:/altera/91/quartus//bin/perl"

--sopc_lib_path="C:\altera\91\ip++c:/altera/91/quartus//../ip/altera/sopc_builder_ip

+c:/altera/91/quartus//../ip/altera/nios2_ip"

Info: Finished elaborating PTF file.

Executing: C:/altera/91/quartus//sopc_builder/bin/sopc_builder

--classic --generate C:/user/v300/DE3_150_DDR2_1G_2RANK_ssram_haha/DE3_SOPC.ptf

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