~/.../p2-t1-c3-file-system/event-loop(master)]$ node callstack.js 
Trace: -----------At squared-----------
    at squared (/Users/casiano/campus-virtual/1920/sytws1920/ull-mii-sytws-1920.github.io/tema1-introduccion/practicas/p2-t1-c3-file-system/event-loop/callstack.js:8:11)
    at printSquare (/Users/casiano/campus-virtual/1920/sytws1920/ull-mii-sytws-1920.github.io/tema1-introduccion/practicas/p2-t1-c3-file-system/event-loop/callstack.js:13:11)
    at Object.<anonymous> (/Users/casiano/campus-virtual/1920/sytws1920/ull-mii-sytws-1920.github.io/tema1-introduccion/practicas/p2-t1-c3-file-system/event-loop/callstack.js:16:21)
    at Module._compile (internal/modules/cjs/loader.js:936:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:947:10)
    at Module.load (internal/modules/cjs/loader.js:790:32)
    at Function.Module._load (internal/modules/cjs/loader.js:703:12)
    at Function.Module.runMain (internal/modules/cjs/loader.js:999:10)
    at internal/main/run_main_module.js:17:11
Trace: -----------At multiply-----------
    at multiply (/Users/casiano/campus-virtual/1920/sytws1920/ull-mii-sytws-1920.github.io/tema1-introduccion/practicas/p2-t1-c3-file-system/event-loop/callstack.js:3:11)
    at squared (/Users/casiano/campus-virtual/1920/sytws1920/ull-mii-sytws-1920.github.io/tema1-introduccion/practicas/p2-t1-c3-file-system/event-loop/callstack.js:9:10)
    at printSquare (/Users/casiano/campus-virtual/1920/sytws1920/ull-mii-sytws-1920.github.io/tema1-introduccion/practicas/p2-t1-c3-file-system/event-loop/callstack.js:13:11)
    at Object.<anonymous> (/Users/casiano/campus-virtual/1920/sytws1920/ull-mii-sytws-1920.github.io/tema1-introduccion/practicas/p2-t1-c3-file-system/event-loop/callstack.js:16:21)
    at Module._compile (internal/modules/cjs/loader.js:936:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:947:10)
    at Module.load (internal/modules/cjs/loader.js:790:32)
    at Function.Module._load (internal/modules/cjs/loader.js:703:12)
    at Function.Module.runMain (internal/modules/cjs/loader.js:999:10)
    at internal/main/run_main_module.js:17:11