solved memory issues

bwa.wdl

@@ -6,7 +6,7 @@ task mem {
     String? outputFile = "aligned.bam"
     String? preCommand
     Int? threads = 1
-    String? memory = "4G"
+    Int? memory = 4
     Int? minimumSeedLength
     Int? w
     Int? d

cutadapt.wdl

@@ -6,7 +6,7 @@ task cutadapt {
     String? format
     String? preCommand
     Int? cores = 1
-    String? memory = "4G"
+    Int? memory = 4
     Array[String]+? adapter
     Array[String]+? front
     Array[String]+? anywhere
@@ -122,4 +122,4 @@ task cutadapt {
         cpu: select_first([cores])
         memory: select_first([memory])
     }
-}
+}
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spades.wdl

@@ -74,6 +74,6 @@ task spades {
     }
     runtime {
         cpu: select_first([threads])
-        memory: select_first([memoryGb]) + "G"
+        memory: select_first([memoryGb])
     }
 }
\ No newline at end of file