Use interpolate strings instead nude variables for prevent
Use interpolate strings instead nude variables for prevent

transformation binary operator to unary.

Change-Id: I414864017f1b41f0b9daa67b0c451c13f28a022b
Closes-bug: #1517412

huntxu/fuel-library,stackforge/fuel-library,huntxu/fuel-library,huntxu/fuel-library,eayunstack/fuel-library,huntxu/fuel-library,eayunstack/fuel-library,stackforge/fuel-library,stackforge/fuel-library,huntxu/fuel-library,eayunstack/fuel-library,eayunstack/fuel-library,xarses/fuel-library,eayunstack/fuel-library,xarses/fuel-library,stackforge/fuel-library,xarses/fuel-library,xarses/fuel-library